This blog post is about our current EV3 robot we're planning to use in the 2023/2024 FLL competition. Some features: 2 large motors for steering. 2 medium motors for attachments. 2 colour sensors for picking up the white and black lines, also used for line squaring. 1 gyro sensor. To enable attachments to be changed as quickly as possible we're using gravity to keep the gears connected, i.e. you don't need to fasten anything to the robot. Every attachment has 2x 12 tooth double bevel gear (part 32270) which comes in contact with the 2x 20 tooth double bevel gears (part 32269) on the robot. The medium motors are horizontally aligned on the robots, but we use 12 tooth double bevel gears to convert that to vertical alignments. These in turn are connected to 20 tooth double bevel gears, and the attachments in turn connect to these 20 tooth double bevel gears with their 12 tooth double bevel gears. The complete robot is modelled in Bricklink Studio 2 . You can download the rob
It happened to me - I've bricked my TP-Link MR3420 router by changing some settings in /etc/config/firewall, with the result that I couldn't get a connection to the router from either a wired or a wireless connection. And the failsafe option also doesn't work on OpenWRT Backfire 10.03.01, so the only remaining option was the use the router's serial port. Enters the Raspberry Pi ( http://www.raspberrypi.org ). The Raspberry Pi has a serial port available on the GPIO pins, and what is nice is that it is operating on the same voltage levels as the TP-Link MR3420's serial port (0V and +3.3V). This means we don't need any RS232 voltage level converters (RS232 goes from -12V to +12V). The only way to get access to the TP-Link MR3420's serial port is to open the router, and solder some wires to the SJ1 connector (see http://wiki.openwrt.org/toh/tp-link/tl-mr3420#serial ). You need to solder at least 3 wires: Tx, Rx and Gnd, which is pins 1-3 on SJ1. You'll